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A single gpt-image-2 output image, produced from a highly structured prompt specifying character identity and a flat magenta chroma-key background, was compiled into the waving.gif animation.

The waving.gif animation was compiled from one gpt-image-2 generated image, created via a prompt with a defined structure: pet identity description plus instructions for a centered pose on a pure magenta background sized for animation. ✦ AI generated

Simon Willison · Simon Willison's Weblog · 2026-07-14 · original ↗

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Create one clean full-body reference sprite for Codex pet Pedalican. Pet identity: A compact adorable baby pelican with a round cream-white body, soft coral-orange bill and feet, riding a tiny sky-blue bicycle [...] Place a single centered pose on a perfectly flat pure magenta #FF00FF chroma-key background. Keep the full pet visible, compact, readable at 192x208, and easy to animate.

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✳ gpt-image-2 ✳ Pedalican

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gives example → GPT-5.6 Sol operating in xhigh mode autonomously designed the custom Codex pet, using multiple rounds of gpt-image-2 to generate the sprite assets.Simon Willison · Simon Willison's Weblog gives example → The full generation process, including every intermediate image, combined sprite sheets, and animation GIFs, was documented and published in a GitHub repo.Simon Willison · Simon Willison's Weblog gives example → This project serves as a useful real-world example of using image generation to create simple, game-ready sprites.Simon Willison · Simon Willison's Weblog